CN101852269B

CN101852269B - In-wheel motor driving unit

Info

Publication number: CN101852269B
Application number: CN2010102141063A
Authority: CN
Inventors: 铃木稔
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2005-08-18
Filing date: 2006-08-18
Publication date: 2011-11-16
Anticipated expiration: 2026-08-18
Also published as: US20090156347A1; EP2476931A1; US20100267509A1; CN101233342A; EP1916444A4; WO2007020999A1; EP2233783A1; US8038562B2; EP2233783B1; US8033943B2; CN101852269A; EP1916444A1; CN101233342B

Abstract

A compact power transmission device reduced in the number of parts and capable of transmitting a rotation input into a rotating shaft to wheels with a large reduction ratio. The rotary shaft (11) is installed coaxially with an inward member (3) formed of a hub wheel (4) and a bearing inner ring (5), and outer gears (16a, 16b) are rotatably installed on the outsides of eccentric parts (14a, 14b) formed on the rotary shaft (11). The outer gears (16a, 16b) are meshed with an internal gear (18) formed in the inner periphery of a casing (1), and the rotary shaft is rotated to revolve the outer gears (16a, 16b) by the engagement thereof one by one with the internal gear (18) and rotate the outer gears (16a, 16b) by an amount of a difference in the number of teeth between an external gear (17) and the internal gear (18) for each rotation of the rotary shaft (11), and its rotating motion is transmitted to the inward member (3) through a torque transmission means (20) to rotate the inward member (3) at a reduced speed.

Description

Wheel motor drive device

The application be that August 18, application number in 2006 are 200680027996.9 the applying date, denomination of invention divides an application for the application of " power transmitting deice ".

Technical field

The present invention relates to a kind ofly make the rotational delay that is input to running shaft and it is passed to the power transmitting deice of the wheel of vehicle.

Background technique

As the power transmitting deice to the wheel transferring power of vehicle, known in the past have patent documentation 1 and patent documentation 2 disclosed devices.The wheel hub motor that patent documentation 1 is put down in writing (in-wheel motor) drive unit has: produce driving force motor, connecting wheel deflecting roller wheel axle and the rotating speed of above-mentioned motor is slowed down and it is passed to the speed reducer of wheel axle, as above-mentioned speed reducer, adopted the parallel-axis type gear reduction unit that constitutes by the different a plurality of gears of the combination number of teeth.

On the other hand, in the used for electric vehicle speed reducer that patent documentation 2 is put down in writing, between the wheel hub (hub) of big rotor of electronic horse and wheel, be provided with the planetary gear type reducing gear, will distribute to left and right wheels under the spring via live axle from the output of second section planetary gear type reducing gear with two-part.

Patent documentation 1: the spy opens the 2005-7914 communique

Patent documentation 2: the spy opens flat 5-332401 communique

Yet, in the wheel motor drive device that patent documentation 1 is put down in writing, owing to do not need large-scale power transmission mechanism such as screw shaft (propeller shaft) or differential attachment, so, it is noticeable at aspects such as the lightweight of vehicle and miniaturizations, but the reduction speed ratio of parallel-axis type gear reduction unit is about 1/2 to 1/3, this is not enough as the speed reducer that is carried in the wheel motor drive device, and, because the weight of speed reducer is also heavy, exist the problem that can cause taking the sensation variation because of the increase of unsprung weight, therefore, also do not reach practicability.

On the other hand, compare with the parallel-axis type gear reduction unit, the planetary gear type reducing gear of patent documentation 2 described used for electric vehicle speed reducer can access big reduction speed ratio, even but it is insufficient as the speed reducer that carries in the wheel motor drive device.In order to obtain enough reduction speed ratio, need the planetary gear type reducing gear of multistage formation by carrier (carrier) formation of central gear (sun gear), ring gear (ring gear), small gear and small gear, but because the member number increases, be difficult to miniaturization, therefore will cause the weight of speed reducer and size to increase.

Summary of the invention

Problem of the present invention is, provides a kind of and can pass to wheel and member number with the rotation that big reduction speed ratio will be input to running shaft less and can realize the power transmitting deice of miniaturization structure.

In order to solve above-mentioned problem, the invention provides a kind of power transmitting deice, it comprises: foreign side's member, it is installed on car body, is formed with the multiple row plane of trajectory orbital in the end in the outside week; In square member, its periphery have along radially with the opposed multiple row plane of trajectory orbital of multiple row plane of trajectory orbital of described foreign side member, be formed with the flange that wheel is installed usefulness in the end of the outside that is positioned at foreign side's member periphery; The multiple row rolling element, it is assembled between the multiple row plane of trajectory orbital of the multiple row plane of trajectory orbital of described foreign side member and interior side's member; Running shaft, its with described in square member be configured in coaxial on, the part in the inside that is positioned at described foreign side member is formed with eccentric part; External gear, it is supported by the eccentric part of described running shaft and rotates freely, and with the internal tooth engagement that is provided with in interior week at described foreign side member, and this internal tooth of gear ratio is few; And torque-transmitting mechanisms, its be arranged on described external gear and described in square member each other, make the revolution motion freedom with the off-centre of eccentric part rotation external gear together, and square member in spinning motion passed to.

In the power transmitting deice that constitutes by said structure, if make the running shaft rotation, then eccentric part will carry out off-centre rotation, be supported by this eccentric part on one side and the external gear that rotates freely meshes with the internal tooth that forms in interior week at foreign side's member one by one, Yi Bian be to revolve round the sun in the center with the running shaft.

At this moment, because the number of the external tooth of external gear is lacked than the number at the internal tooth of the interior week formation of foreign side's member, so, whenever running shaft rotates a circle, external gear all can be towards the direction rotation internal tooth opposite with the sense of rotation of running shaft and the number of teeth residual quantity of external tooth, and via torque-transmitting mechanisms with this spinning motion pass in square member, make the rotational delay of above-mentioned running shaft pass to the wheel that is connected with interior side's member.

Here, can constitute involute profile or the external tooth that will form in the periphery of external gear constitutes trochoid (trochoid) profile of tooth with the external tooth that forms in the periphery of external gear and at the internal tooth that forms in interior week of foreign side's member, make the described internal tooth with this external tooth engagement become export trade.If adopt the latter's mode, constitute the trochoid profile of tooth by the external tooth that will form in the periphery of external gear, internal tooth is constituted export trade, then contact-ratio not only can be improved, and the losing less of tooth, power transmitting deice that durability is outstanding can be obtained.

In power transmitting deice of the present invention, can constitute by the hub wheel and the bearing inner race of the flange that has wheel installation usefulness in periphery as interior side's member, this bearing inner race is inserted in the described hub wheel, and has in the end in the outside by from the fastening and tube portion that be combined into one with hub wheel of the hole enlargement of inside diameter.

And, can adopt following formation as torque-transmitting mechanisms: along interior side's member axially with a side of the opposed opposed faces of external gear on so that a plurality of being sold inside the country uniformly-spaced to be set on concentric circle, each sold inside the country diameter of forming on the opposing party of opposed faces of being inserted into than in the directly big circular port of pin, is made each interior all a part of contact sold inside the country and each circular port.

Here, be to rotate freely with above-mentioned sold inside the country supporting, or roller is being rotated freely with sold inside the country chimeric, when each roller is contacted with interior all parts of circular port, owing to sold inside the country become the contact of rolling with contacting of circular port, so, the reductionization of contact resistance, realization torque loss can be reduced.

In power transmitting deice of the present invention, by according to the center of gravity of balancer weight with respect to eccentric direction position on Zhou Fangxiang of eccentric part mode of 180 ° that staggers, balancer weight is installed on the running shaft, can rotate the off-centre of offsetting because of external gear by the off-centre of above-mentioned balancer weight and rotate the vibration that causes, produce few power transmitting deice thereby can access vibration.

And, is two with the external gear supporting for rotation eccentric part freely, and these two eccentric parts are staggered 180 ° of phase places and be provided with on Zhou Fangxiang, can transmit the power of running shaft from the inside side's member of two paths, therefore, not only can alleviate from the burden of the rotating power of paths transmission, can also transmit more stable rotation power, and, the vibration that can cancel out each other and produce because of the rotation of the off-centre of eccentric part, so, can obtain vibrating the few power transmitting deice of generation.

And, be connected with running shaft by the rotor that will rotate driving motor, can form small-sized, compact wheel motor drive device.

The invention effect

As mentioned above, in the present invention, if make the running shaft rotation, then whenever above-mentioned running shaft rotates a circle, the number of teeth residual quantity of the external tooth that the external gear that is supported by eccentric part all can rotation forms in the internal tooth that forms in interior week of foreign side's member and periphery at external gear, and square member in by torque-transmitting mechanisms its spinning motion being passed to, therefore, can pass to interior side's member that wheel is installed with the rotation that big reduction speed ratio will be input to running shaft.

In addition, since reducing gear be by at the internal tooth that forms in interior week of foreign side's member, be rotated the torque-transmitting mechanisms structure that constitute, that the member number is few of the spinning motion of external gear that the eccentric part of axle supports and transmission external gear, so, can obtain the power transmitting deice of compact structure.

Description of drawings

Fig. 1 is the vertical profile plan view of the mode of execution of expression power transmitting deice of the present invention.

Fig. 2 is the sectional drawing that the eccentric part that is arranged at running shaft of Fig. 1 is amplified expression.

Fig. 3 is the sectional drawing along the III-III line of Fig. 1.

Fig. 4 is the sectional drawing that the part of Fig. 3 is amplified expression.

Fig. 5 is the vertical profile plan view of other mode of executions of expression power transmitting deice of the present invention.

Among the figure: 1-housing (foreign side's member), 2-plane of trajectory orbital, square member in the 3-, 4-hub wheel (hubwheel), 5-bearing inner race, 5a-tube portion, the 6-wheel is installed with flange (flange), 7-plane of trajectory orbital, 8-plane of trajectory orbital, the 10-rolling element, 11-running shaft, 14a-eccentric part, the 14b-eccentric part, 16a-external gear, 16b-external gear, the 17-external tooth, 18-internal tooth, 18a-export trade, the 18b-roller, the 20-torque-transmitting mechanisms, 21-is sold inside the country, the 22-roller, the 23-circular port, 24-balancer weight (count weight), 30-motor, 32-rotor.

Embodiment

With reference to the accompanying drawings embodiments of the present invention are described.As shown in Figure 1, housing 1 as the foreign side's member that is installed on car body, by shell main body 1a with the inboard (inboard) of this shell main body 1a open-ended carried out inaccessible cover 1b constitute, in the end in the outside of above-mentioned shell main body 1a (outboard), be formed with multiple row plane of trajectory orbital 2 week.

Square member 3 in the end in the outside of housing 1, being provided with.Interior square member 3 is made of hub wheel 4 and bearing inner race 5, and bearing inner race 5 at one end portion has a 5a of portion, and the 5a of this is embedded in the hub wheel 4, by fastening and integrated with hub wheel 4 from the hole enlargement of inside diameter.

In addition, in order to improve based on the fastening combination force of hole enlargement, preferably at least one side at the outer diametric plane of the aperture surface of hub wheel 4 and the 5a of tube portion is pre-formed fine concavo-convex 5b.

End periphery in the outside that is positioned at shell 1 of hub wheel 4 is formed with the flange 6 that wheel is installed usefulness.And, being provided with plane of trajectory orbital 7 in the end periphery that is positioned at housing 1 of wheel hub 4, it is opposed with a side of the above-mentioned multiple row plane of trajectory orbital 2 that week forms in the end of housing 1 diametrically.

On the other hand, on the bearing inner race 5, be provided with radially and the opposed plane of trajectory orbital 8 of the opposing party of multiple row plane of trajectory orbital 2, be formed with flange 9 at the other end in one end periphery.

Be assembled with multiple row rolling element 10 between the multiple row plane of trajectory orbital 2 of the multiple row plane of trajectory orbital 7,8 of interior side's member 3 and housing 1, interior side's member 3 rotates freely by this multiple row rolling element 10.

Be arranged on the cover 1b that coaxial running shaft 11 connects housing 1 with interior side's member 3, it is supported to rotation freely by the bearing 13 in the bearing 12 that is assembled in this breakthrough part and the other end that is assembled in bearing inner race 5.

Be provided with two

eccentric part

14a, 14b in the end that is positioned at housing 1 of running shaft 11.For

eccentric part

14a, 14b, phase place misplaces on Zhou Fangxiang 180 °, and by at the chimeric bearing 15 of the periphery of each

eccentric part

14a, 14b,

external gear

16a, 16b are supported to rotation freely.

As shown in Figure 3,

external gear

16a, 16b have a plurality of external tooths 17 in periphery, this external tooth 17 and the internal tooth that is provided with in interior week 18 engagements at housing 1, and the number of aforementioned external teeth 17 is lacked than the number of internal tooth 18.Here, external tooth 17 is made of the trochoid profile of tooth, and in addition, internal tooth 18 is that rotation roller 18b freely constitutes by two end part by the export trade 18a of shell main body 1a and cover 1b supporting with by this export trade 18a supporting.

In mode of execution, as roller 18b as shown in Figure 4, from reducing the viewpoint of radial thickness size, adopted needle roller bearing, but be not limited to this.No matter rolling element is all rolling bearings of roller or ball for example also can to use cylindrical roller bearing, tapered roller bearing, angular contact ball bearing, four-point contact ball, automatic core-adjusting roller bearing etc.

In addition, internal tooth 18 also can omit roller 18b and is made of export trade 18a.And external tooth 17 and internal tooth 18 also can be made of involute profile.

As Fig. 1 and shown in Figure 3, the flange 9 that forms on

external gear

16a, 16b and bearing inner race 5 is provided with torque-transmitting mechanisms 20 each other, its revolution motion that makes

external gear

16a, 16b freely, and inside side's member 3 transmits spinning motions.

Torque-transmitting mechanisms 20 the flange 9 that is formed at bearing inner race 5 with the opposed side of external gear 16b, be on the same circle at center uniformly-spaced to be provided with a plurality of sold inside the country 21 in axle center with bearing inner race 5, by making roller 22 rotation sold inside the country 21 chimeric with each freely, make each roller 22 be positioned at the diameter circular port 23 bigger, and contact with interior all parts of this circular port 23 than the roller diameter that is formed at

external gear

16a, 16b.

In mode of execution, owing to constitute two

eccentric part

14a, 14b be set on the running shaft 11, and

external gear

16a, 16b rotation is arranged at each

eccentric part

14a, 14b freely, so, though in flange 9, be provided with bearing roller 22 sold inside the country 21, in

internal gear

16a, 16b, be provided with circular port 23, but in external gear is set to one power transmitting deice, the sold inside the country of bearing roller can be set in external gear also, in flange, form circular port.

In addition, though adopted needle roller bearing, also can adopt other rolling bearing as roller 22.In addition, also can omit roller 22, rotation supporting freely is sold inside the country 21, and make this sold inside the country 21 with a part of contact of interior week of circular port 23.

As shown in Figure 2, on running shaft 11, be provided with a pair of balancer weight 24 in the outer fix of two eccentric part 14a, 14b.A pair of balancer weight 24 is installed into: its center of gravity g is positioned at the opposite direction of eccentric direction with eccentric part 14a, the 14b of adjacency.

Here, as shown in Figure 2, if with two eccentric part 14a, central point between the 14b is made as G, then by being positioned at the eccentric part 14a that relies on the right side than this central point G, the quality of the eccentric solid of rotation that external gear 16a and balancer weight 24 constitute, with by be positioned at than central point G rely on the left side eccentric part 14b, the quality of the eccentric solid of rotation that external gear 16b and balancer weight 24 constitute equates, and, from by being positioned at the eccentric part 14a that relies on the right side than central point G, the center of gravity of the eccentric solid of rotation that external gear 16a and balancer weight 24 constitute reaches the radial direction distance of axis of rotation to the axial distance of central point G, with from by be positioned at than central point G rely on the left side eccentric part 14b, the center of gravity of the eccentric solid of rotation that external gear 16b and balancer weight 24 constitute reaches the radial direction of axis of rotation apart from equating to the axial distance of central point G, thus, can offset because of the eccentric solid of rotation in right side and the off-centre of the eccentric solid of rotation in left side and rotate the couple that causes.

Power transmitting deice shown in the mode of execution is made of above-mentioned structure, if make running shaft 11 rotations, then

eccentric part

14a, 14b carry out the off-centre rotation, by this

eccentric part

14a, 14b supporting for rotation

external gear

16a, 16b freely on one side one by one with the internal tooth that forms in interior week 18 engagements at housing 1, on one side be to revolve round the sun in the center with running shaft 11.

At this moment, because the number of the external tooth 17 of

external gear

16a, 16b is lacked than the number at the internal tooth 18 of the interior week formation of housing 1, so, whenever running shaft 11 rotates a circle,

external gear

16a, 16b can be towards the number of teeth residual quantity of the direction rotation internal tooth opposite with the sense of rotation of running shaft 11 18 with external tooth 17, and square member 3 in via torque-transmitting mechanisms 20 this spinning motion being passed to, square member 3 rotation of slowing down in making.

Here, be Z if establish the number of teeth of internal tooth 18 ₁, the number of teeth of establishing

external gear

16a, 16b is Z ₂, then reduction speed ratio can be by (Z ₁-Z ₂)/Z ₂Expression.

Like this, in the power transmitting deice of representing by mode of execution, whenever above-mentioned running shaft 11 rotates a circle, with external gear 16a, the 16b of internal tooth 18 engagement all can be by the rotation of running shaft 11, towards the number of teeth residual quantity of the direction rotation internal tooth opposite 18 with external tooth 17 with the sense of rotation of running shaft 11, and square member 3 in via torque-transmitting mechanisms 20 its spinning motion being passed to, therefore, square member 3 in can the rotation of running shaft 11 being passed to big reduction speed ratio.

And, because speed reducer is by

external gear

16a, 16b and the few structure of member number that constitutes at the internal tooth 18 that forms in interior week of housing 1, so, small-sized, compact power transmitting deice can be obtained.

As shown in Figure 5, if the motor 30 that is connected by the shaft end with running shaft 11 makes running shaft 11 rotations, then can form the wheel motor drive device of small-sized, light weight, compactness.

In addition, the stator 31 of motor 30 and rotor 32 can be assembled in the inside of housing 1.

As mentioned above, the control of the power transmitting deice as make running shaft 11 rotations by motor 30, for example can by will be from accelerator pedal position sensor, break tread-on quantity sensor, vehicle speed sensor, battery temperature detecting sensor, input to electronic control unit at the signal of the various sensors such as rotational position detecting sensor of the voltage transducer that connects between the terminal of battery, the current sensor that on line of electric force, is provided with, motor from battery, and between battery and motor, carry out via the electric power of inverter exchange according to these Signal Regulation.

In control, for example can consider to control independently respectively by the rotating speed of this power transmitting deice wheel driven of each position about being arranged on or all around according to the steering angle of steering wheel, make the rotation of vehicle stabilization ground, or according to the idle running of the input wheel of each vehicle-wheel speed sensor of front and back vehicle, control the rotating speed of this power transmitting deice according to this testing result, make the schemes such as stable posture of vehicle.

Claims

1. wheel motor drive device is by reducing gear the outputting power of motor to be passed to the wheel motor drive device that the wheel drive of wheel is used, and comprising:

Running shaft, it rotates under the rotor effect of the motor that is connected in shaft end, and is formed with eccentric part;

Internal tooth;

External gear, it is meshed for rotation freely and with described internal tooth by the supporting of the eccentric part of described running shaft, and this internal tooth of gear ratio is few;

External tooth, it is formed on the periphery of described external gear and is made of the trochoid profile of tooth;

Torque-transmitting mechanisms, it will be converted to spinning motion with the revolution motion of the off-centre of described eccentric part rotation external gear together and carry out transmission of power;

Interior square member, it is formed with plane of trajectory orbital;

Foreign side's member, it is formed with plane of trajectory orbital;

Rolling element, its be assembled in described between the plane of trajectory orbital of the plane of trajectory orbital of square member and described foreign side member,

Described torque-transmitting mechanisms constitutes: square member axially goes up so that a plurality of being sold inside the country uniformly-spaced to be set on concentric circle with a side of the opposed opposed faces of described external gear in described, each sold inside the country diameter of forming on the opposing party of opposed faces of being inserted into than in the directly big circular port of pin, is made each interior all a part of contact sold inside the country and each circular port.

2. wheel motor drive device according to claim 1, wherein,

, with respect to eccentric direction position on Zhou Fangxiang of eccentric part mode of 180 ° that staggers balancer weight is installed on the described running shaft according to the center of gravity of balancer weight.

3. wheel motor drive device according to claim 1, wherein,

Is two with the supporting of described external gear for rotation eccentric part freely, and these two eccentric parts are staggered 180 ° of phase places and is provided with on Zhou Fangxiang.

4. wheel motor drive device according to claim 2, wherein,

5. according to each described wheel motor drive device in the claim 1～4, wherein,

Described internal tooth is that rotation roller freely constitutes by export trade with by described export trade supporting.

6. wheel motor drive device according to claim 5, wherein,

Described roller has adopted needle roller bearing.

7. according to each described wheel motor drive device in the claim 1～4, wherein,

Freely with described sold inside the country chimeric, this roller is contacted with interior all parts of circular port the roller rotation.

8. wheel motor drive device according to claim 5, wherein,

9. wheel motor drive device according to claim 6, wherein,